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Updated the 2nd external link, to the 10GBE fault signaling document. |
clarified brocade support |
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For each device and for each port, a UDLD packet is sent to the port it links to. The packet contains sender identity information (device and port), and expected receiver identity information (device and port). Each port checks that the UDLD packets it receives contain the identifiers of his own device and port.
UDLD is a Cisco-proprietary protocol. Switches from [[3Com]] and its Enterprise division H3C have a similar feature called Device Link Detection Protocol (DLDP). Switches from [[Extreme Networks]] have a similar feature called Extreme Link Status Monitoring (ELSM). Similar functionality in a standardized form is provided as part of the [[Ethernet]] [[OA&M|OAM]] protocol that is defined as part of the [[Ethernet in the First Mile]] changes to [[802.3]] (previously [[802.3ah]]). D-Link has their DULD feature built on top of [[Ethernet]] [[OA&M|OAM]] function. Brocade devices
The need for UDLD has been eliminated when operating over 10GbE, as per 802.3ae/D3.2, when a fault is detected in the physical link:
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